Forschung
Die Arbeitsgruppe um Robert Huber forscht in den Bereichen der optischen Kohärenztomographie (OCT), der nichtlinearen Bildgebung und der Laserphysik. Hierbei wird vor allem an neuartigen Pikosekundenlaser und an Fourier domain modengekoppelten (FDML) Lasern gearbeitet. Dieses Laserkonzept wurde von Robert Huber entwickelt und erlaubt, besonders schnell durchstimmbare Laserlichtquellen zu realisieren. Die Forschungsschwerpunkte liegen hier in der technologischen Weiterentwicklung, dem Verständnis der physikalischen Vorgänge und auch in der Implementierung von FDML Lasern für OCT. Neben der OCT werden FDML Laser auch für die nichtlineare Bildgebung und Spektroskopie verwendet.
Ein weiterer Schwerpunkt liegt in der optischen Kohärenztomographie mit durchstimmbaren Lichtquellen (swept source OCT, SS-OCT). Hier werden unter anderem die selbst entwickelten FDML Laser für die ultraschnelle Bildgebung eingesetzt, um Schnittbilder von biologischen Gewebe wie Haut oder Auge zu erzeugen. Aufgrund der hohen Durchstimmrate sind Anwendungen wie die VR-OCT, die in einer virtuellen Umgebung ganze Volumina mit Video-Wiederholraten in Echtzeit darstellt, möglich.
Mit der nichtlinearen optischen Bildgebung verfolgt die Arbeitsgruppe weitere Bildgebungsverfahren. Die Forschungsgebiete liegen in der zeitcodierten (TICO) Ramanspektroskopie und -mikroskopie, der Zweiphotonen-Fluoreszenzmikroskopie (TPEF) und der Zweiphotonen-Einzelpuls-Fluoreszenzlebenszeitbildgebung (SP-FLIM). Für diese Verfahren kommen neuartige Pikosekunden zum Einsatz die ebenfalls in der Arbeitsgruppe erforscht und entwickelt werden.
Unsere Forschungsschwerpunkte:
- Fourier Domain Mode Locked (FDML) Laser - Laserphysik, Technologie und Anwendung
- Optische Kohärenztomographie (OCT) - Anwendungen der MHz-OCT an Haut und Auge
- Nichtlineare Mikroskopie und Spektroskopie
- Pikosekundenlaser
Publikationen
2025
Flow-Controlled Air-Jet for In Vivo Quasi Steady-State and Dynamic Elastography With MHz Optical Coherence Tomography, IEEE Transactions on Biomedical Engineering , vol. 72, no. 3, pp. 1008-1020, Mä. 2025.
DOI: | 10.1109/TBME.2024.3484676 |
Bibtex: | ![]() @ARTICLE{10726870, author={Detrez, Nicolas and Burhan, Sazgar and Rewerts, Katarina and Kren, Jessica and Buschschlüter, Steffen and Theisen-Kunde, Dirk and Bonsanto, Matteo Mario and Huber, Robert and Brinkmann, Ralf}, journal={IEEE Transactions on Biomedical Engineering}, title={Flow-controlled air-jet for in vivo quasi steady-state and dynamic elastography with MHz optical coherence tomography}, year={2024}, volume={}, number={}, pages={1-12}, keywords={Force;Biomedical measurement;Pressure measurement;In vivo;Steady-state;Generators;Elastography;Valves;Force measurement;Optical coherence tomography;Air-Jet;Air-Puff;Optical Coherence Elastography;Stiffness;Tissue Mechanics;Young's Modulus}, doi={10.1109/TBME.2024.3484676}} |
1.7MHz, 840nm swept-source ophthalmic OCT, in Ophthalmic Technologies XXXV , Daniel X. Hammer and Derek Nankivil and Yuankai K. Tao, Eds. SPIE, Mä.2025. pp. 1330004.
DOI: | 10.1117/12.3045055 |
Bibtex: | ![]() @inproceedings{10.1117/12.3045055, author = {Marie Klufts and Wolfgang Draxinger and Simon Lotz and Robert Huber}, title = {{1.7MHz, 840nm swept-source ophthalmic OCT}}, volume = {13300}, booktitle = {Ophthalmic Technologies XXXV}, editor = {Daniel X. Hammer and Derek Nankivil and Yuankai K. Tao}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {1330004}, keywords = {swept source, SS-OCT, FDML , Retinal imaging, ophthalmic imaging, OCT, 850 nm, short wavelength}, year = {2025}, doi = {10.1117/12.3045055}, URL = {https://doi.org/10.1117/12.3045055} } |
Switchable lateral resolution real-time MHz-OCT rectoscopy for enhanced colorectal disease diagnosis, in Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIX , Rainer A. Leitgeb and Yoshiaki Yasuno, Eds. SPIE, Mä.2025. pp. 1330512.
DOI: | 10.1117/12.3046222 |
Bibtex: | ![]() @inproceedings{10.1117/12.3046222, author = {Sazgar Burhan and Berenice Schulte and Madita G{\"o}b and Awanish Pratap Singh and Bayan Mustafa and Simon Lotz and Wolfgang Draxinger and Philipp Lamminger and Yasmeine Saker and Tim Eixmann and Martin Ahrens and Marvin Heimke and Tillmann Heinze and Thilo Wedel and Maik Rahlves and Mark Ellrichmann and Robert Huber}, title = {{Switchable lateral resolution real-time MHz-OCT rectoscopy for enhanced colorectal disease diagnosis}}, volume = {13305}, booktitle = {Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIX}, editor = {Rainer A. Leitgeb and Yoshiaki Yasuno}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {1330512}, abstract = {Endoscopic optical coherence tomography (OCT) offers in vivo live visualization of transmural structures with histological resolution, making it a valuable tool in medical imaging. In gastroenterology, OCT endoscopy is particularly advantageous for assessing rectal wall layers, providing superior axial and lateral resolution compared to conventional rectal endoscopic ultrasound. However, the large diameter and uneven colon surface present challenges for comprehensive imaging. Extending the OCT imaging range addresses this issue by enabling a thorough examination of the entire colon, facilitating the detection of surface polyps, tumors, and their infiltration depth. Once these regions of interest are identified, high-resolution imaging becomes essential for detailed evaluation. To meet these demands, this study integrates two different imaging modes, an extended-range mode, and a high-detail mode, within a rigid rectoscope. The extended-range mode enables visualization of deeper structures, while the high-detail mode enhances image quality for precise, contact-based assessments. The system allows seamless, real-time transitions between the modes using a 3.2MHz-OCT system and a fiber‑optic MEMS switch.}, keywords = {Optical Coherence Tomography, Megahertz OCT, Fourier Domain Mode Locking, Three-dimensional image acquisition, Rectal Imaging, Long-Range Imaging, Non-Invasive Diagnostic Imaging, Tumor Assessment}, year = {2025}, doi = {10.1117/12.3046222}, URL = {https://doi.org/10.1117/12.3046222} } |
Towards ultrahigh resolution MHz retinal SS-OCT: 187nm section-wise tuning of a FDML laser at 1050nm, in Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIX , Rainer A. Leitgeb and Yoshiaki Yasuno, Eds. SPIE, Mä.2025. pp. 133050K.
DOI: | 10.1117/12.3046386 |
Bibtex: | ![]() @inproceedings{10.1117/12.3046386, author = {M. A. Bashir and M. Klufts and S. Lotz and R. Huber}, title = {{Towards ultrahigh resolution MHz retinal SS-OCT: 187nm section-wise tuning of a FDML laser at 1050nm}}, volume = {13305}, booktitle = {Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIX}, editor = {Rainer A. Leitgeb and Yoshiaki Yasuno}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {133050K}, , keywords = {wavelength-swept laser, FDML lasers, Optical coherence tomography, Fourier domain mode locked lasers, Broadband lasers, tunable lasers, swept lasers, swept source OCT}, year = {2025}, doi = {10.1117/12.3046386}, URL = {https://doi.org/10.1117/12.3046386} } |
Large-area dynamic contrast MHz optical coherence tomography for label-free imaging of porcine tissue, in Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIX , Rainer A. Leitgeb and Yoshiaki Yasuno, Eds. SPIE, Mä.2025. pp. 1330502.
DOI: | 10.1117/12.3046216 |
Bibtex: | ![]() @inproceedings{10.1117/12.3046216, author = {Sazgar Burhan and Madita G{\"o}b and Mario Pieper and Tjalfe Laedtke and Thorge Grahl and Michael M{\"u}nter and Hinnerk Schulz-Hildebrandt and Gereon H{\"u}ttmann and Peter K{\"o}nig and Robert Huber}, title = {{Large-area dynamic contrast MHz optical coherence tomography for label-free imaging of porcine tissue}}, volume = {13305}, booktitle = {Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIX}, editor = {Rainer A. Leitgeb and Yoshiaki Yasuno}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {1330502}, abstract = {We demonstrate a 3.2 MHz-OCT system for inter-volumetric dynamic optical coherence tomography of ex vivo porcine kidney tissue. Employing a home-built Fourier Domain mode locking (FDML) laser with a 1310 nm wavelength, the system achieved a lateral resolution of 3.48 μm and a frame rate of 612 Hz. A motorized XYZ positioning stage enabled the precise acquisition of multiple volumes, which were seamlessly stitched together to generate a comprehensive dataset with a total area of 2.6 × 2.6 mm<sup>2</sup>. Validations against histological sections confirmed the system’s ability to visualize cellular tissue structures.}, keywords = {Optical Coherence Tomography, Megahertz OCT, Fourier Domain Mode Locking, Dynamic OCT, Functional OCT, Three-dimensional image acquisition, Tissue Dynamics, Kidney}, year = {2025}, doi = {10.1117/12.3046216}, URL = {https://doi.org/10.1117/12.3046216} } |
2024
Microscope integrated MHz optical coherence tomography system for neurosurgery: development and clinical in-vivo imaging, Biomed. Opt. Express , vol. 15, no. 10, pp. 5960--5979, Okt. 2024. Optica Publishing Group.
DOI: | 10.1364/BOE.530976 |
Bibtex: | ![]() @article{Draxinger:24, author = {Wolfgang Draxinger and Nicolas Detrez and Paul Strenge and Veit Danicke and Dirk Theisen-Kunde and Lion Sch\"{u}tzeck and Sonja Spahr-Hess and Patrick Kuppler and Jessica Kren and Wolfgang Wieser and Matteo Mario Bonsanto and Ralf Brinkmann and Robert Huber}, journal = {Biomed. Opt. Express}, keywords = {Brain imaging; Imaging systems; In vivo imaging; Magnetic resonance imaging; Speckle imaging; Spectral domain optical coherence tomography}, number = {10}, pages = {5960--5979}, publisher = {Optica Publishing Group}, title = {Microscope integrated MHz optical coherence tomography system for neurosurgery: development and clinical in-vivo imaging}, volume = {15}, month = {Oct}, year = {2024}, url = {https://opg.optica.org/boe/abstract.cfm?URI=boe-15-10-5960}, doi = {10.1364/BOE.530976}, abstract = {Neurosurgical interventions on the brain are impeded by the requirement to keep damages to healthy tissue at a minimum. A new contrast channel enhancing the visual separation of malign tissue should be created. A commercially available surgical microscope was modified with adaptation optics adapting the MHz speed optical coherence tomography (OCT) imaging system developed in our group. This required the design of a scanner optics and beam delivery system overcoming constraints posed by the mechanical and optical parameters of the microscope. High quality volumetric OCT C-scans with dense sample spacing can be acquired in-vivo as part of surgical procedures within seconds and are immediately available for post-processing.}, } |
Hochauflösende Rektoskopie mittels dual-mode MHz optischer Kohärenztomographie - ein Schritt zur real time 3D Endoskopie, Z Gastroenterol , vol. 62, no. 09, pp. KV 355, Sep. 2024. Georg Thieme Verlag KG.
DOI: | 10.1055/s-0044-1790019 |
Bibtex: | ![]() @Article{Schulte2024, author={Schulte, B.; Burhan, S.; Singh, A. P.; Draxinger, W.; Lotz, S.; Heimke, M.; Heinze, T.; Wedel, T.; Rahlves, M.; Huber, R.; Ellrichmann, M.}, title={Hochaufl{\"o}sende Rektoskopie mittels dual-mode MHz optischer Koh{\"a}renztomographie -- ein Schritt zur real time 3D Endoskopie}, journal={Z Gastroenterol}, year={2024}, month={Sep}, day={26}, publisher={Georg Thieme Verlag KG}, volume={62}, number={09}, pages={KV 355}, issn={0044-2771}, doi={10.1055/s-0044-1790019}, url={http://www.thieme-connect.com/products/ejournals/abstract/10.1055/s-0044-1790019}, url={https://doi.org/10.1055/s-0044-1790019}, language={DE} } |
Harmonic Imaging of Stem Cells in Whole Blood at GHz Pixel Rate, Small , pp. 2401472, Jun. 2024.
DOI: | https://doi.org/10.1002/smll.202401472 |
Bibtex: | ![]() @article{https://doi.org/10.1002/smll.202401472, author = {Karpf, Sebastian and Glöckner Burmeister, Nina and Dubreil, Laurence and Ghosh, Shayantani and Hollandi, Reka and Pichon, Julien and Leroux, Isabelle and Henkel, Alessandra and Lutz, Valerie and Jurkevičius, Jonas and Latshaw, Alexandra and Kilin, Vasyl and Kutscher, Tonio and Wiggert, Moritz and Saavedra-Villanueva, Oscar and Vogel, Alfred and Huber, Robert A. and Horvath, Peter and Rouger, Karl and Bonacina, Luigi}, title = {Harmonic Imaging of Stem Cells in Whole Blood at GHz Pixel Rate}, journal = {Small}, volume = {n/a}, number = {n/a}, pages = {2401472}, keywords = {fiber lasers, harmonic imaging, multiphoton microscopy, nanoparticles, regenerative medicine, SHG, SLIDE}, doi = {https://doi.org/10.1002/smll.202401472}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202401472}, eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/smll.202401472}, abstract = {Abstract The pre-clinical validation of cell therapies requires monitoring the biodistribution of transplanted cells in tissues of host organisms. Real-time detection of these cells in the circulatory system and identification of their aggregation state is a crucial piece of information, but necessitates deep penetration and fast imaging with high selectivity, subcellular resolution, and high throughput. In this study, multiphoton-based in-flow detection of human stem cells in whole, unfiltered blood is demonstrated in a microfluidic channel. The approach relies on a multiphoton microscope with diffractive scanning in the direction perpendicular to the flow via a rapidly wavelength-swept laser. Stem cells are labeled with metal oxide harmonic nanoparticles. Thanks to their strong and quasi-instantaneous second harmonic generation (SHG), an imaging rate in excess of 10 000 frames per second is achieved with pixel dwell times of 1 ns, a duration shorter than typical fluorescence lifetimes yet compatible with SHG. Through automated cell identification and segmentation, morphological features of each individual detected event are extracted and cell aggregates are distinguished from isolated cells. This combination of high-speed multiphoton microscopy and high-sensitivity SHG nanoparticle labeling in turbid media promises the detection of rare cells in the bloodstream for assessing novel cell-based therapies.} } |
Large area robotically assisted optical coherence tomography (LARA-OCT), Biomed. Opt. Express , vol. 15, no. 6, pp. 3993-4009, Jun. 2024. Optica Publishing Group.
DOI: | 10.1364/BOE.525524 |
Bibtex: | ![]() @article{Lotz:24, author = {Simon Lotz and Madita G\"{o}b and Sven B\"{o}ttger and Linh Ha-Wissel and Jennifer Hundt and Floris Ernst and Robert Huber}, journal = {Biomed. Opt. Express}, keywords = {Angiography; Biomedical imaging; In vivo imaging; Machine vision; Point clouds; Spectral domain optical coherence tomography}, number = {6}, pages = {3993--4009}, publisher = {Optica Publishing Group}, title = {Large area robotically assisted optical coherence tomography (LARA-OCT)}, volume = {15}, month = {Jun}, year = {2024}, url = {https://opg.optica.org/boe/abstract.cfm?URI=boe-15-6-3993}, doi = {10.1364/BOE.525524}, abstract = {We demonstrate large-area robotically assisted optical coherence tomography (LARA-OCT), utilizing a seven-degree-of-freedom robotic arm in conjunction with a 3.3\&\#x2005;MHz swept-source OCT to raster scan samples of arbitrary shape. By combining multiple fields of view (FOV), LARA-OCT can probe a much larger area than conventional OCT. Also, nonplanar and curved surfaces like skin on arms and legs can be probed. The lenses in the LARA-OCT scanner with their normal FOV can have fewer aberrations and less complex optics compared to a single wide field design. This may be especially critical for high resolution scans. We directly use our fast MHz-OCT for tracking and stitching, making additional machine vision systems like cameras, positioning, tracking or navigation devices obsolete. This also eliminates the need for complex coordinate system registration between OCT and the machine vision system. We implemented a real time probe-to-surface control that maintains the probe alignment orthogonal to the sample by only using surface information from the OCT images. We present OCT data sets with volume sizes of 140\&\#x2009;\&\#x00D7;\&\#x2009;170\&\#x2009;\&\#x00D7;\&\#x2009;20 mm3, captured in 2.5 minutes.}, } |
Dispersion-Tuned Mode-Locked Laser for Swept Source OCT At 850 Nm Using a cFBG and the Pulse Modulation Technique, IEEE Photonics Journal , pp. 1-6, Mai 2024.
DOI: | 10.1109/JPHOT.2024.3417829 |
Bibtex: | ![]() @ARTICLE{10568460, author={Riha, Rene and Jimenez, Alejandro Martinez and Venugopal, Gopika and Klufts, Marie and Huber, Robert and Podoleanu, Adrian}, journal={IEEE Photonics Journal}, title={Dispersion-Tuned Mode-Locked Laser for Swept Source OCT At 850 Nm Using a cFBG and the Pulse Modulation Technique}, year={2024}, volume={}, number={}, pages={1-6}, keywords={Modulation;Dispersion;Semiconductor optical amplifiers;Optical interferometry;Optical pulses;Frequency modulation;Optical fiber amplifiers;OCT;dispersion tuning;cFBG;intensity modulator}, doi={10.1109/JPHOT.2024.3417829}} |
Optical coherence tomography-based imaging biomarkers for disease activity monitoring in plaque psoriasis, Journal of the European Academy of Dermatology and Venereology , Mai 2024.
DOI: | https://doi.org/10.1111/jdv.20097 |
Bibtex: | ![]() @article{https://doi.org/10.1111/jdv.20097, author = {Ha-Wissel, L. and Graßhoff, H. and Göb, M. and Mustafa, B. and Huber, R. and Zirpel, H. and Yasak, H. and Thaçi, D. and Hundt, J. E.}, title = {Optical coherence tomography-based imaging biomarkers for disease activity monitoring in plaque psoriasis}, journal = {Journal of the European Academy of Dermatology and Venereology}, volume = {n/a}, number = {n/a}, pages = {}, doi = {https://doi.org/10.1111/jdv.20097}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/jdv.20097}, eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1111/jdv.20097} } |
Contrast enhanced endoscopic ultrasound detects early therapy response following anti-TNF-therapy in patients with ulcerative colitis, Journal of Crohn's and Colitis , pp. jjae034, Mä. 2024.
DOI: | 10.1093/ecco-jcc/jjae034 |
Bibtex: | ![]() @article{10.1093/ecco-jcc/jjae034, author = {Ellrichmann, Mark and Schulte, Berenice and Conrad, Claudio C and Schoch, Stephan and Bethge, Johannes and Seeger, Marcus and Huber, Robert and Goeb, Madita and Arlt, Alexander and Nikolaus, Susanna and Röcken, Christoph and Schreiber, Stefan}, title = "{Contrast enhanced endoscopic ultrasound detects early therapy response following anti-TNF-therapy in patients with ulcerative colitis}", journal = {Journal of Crohn's and Colitis}, pages = {jjae034}, year = {2024}, month = {03}, abstract = "{Though colonoscopy plays a crucial role in assessing active ulcerative colitis (aUC), its scope is limited to the mucosal surface. Endoscopic ultrasound (EUS) coupled with contrast-enhancement (dCEUS) can precisely quantify bowel wall thickness and microvascular circulation, potentially enabling the quantitative evaluation of inflammation.We conducted a prospective, longitudinal study to assess therapy response using dCEUS in aUC patients undergoing treatment with adalimumab (ADA) or infliximab (IFX).30 ADA- and 15 IFX-treated aUC patients were examined at baseline and at 2, 6, 14 weeks of therapy and 48 weeks of follow-up. Bowel wall thickness (BWT) was measured by EUS in the rectum. Vascularity was quantified by dCEUS using Rise Time (RT) and Time To Peak (TTP). Therapy response was defined after 14 weeks using the Mayo Score.Patients with aUC displayed a mean BWT of 3.9±0.9 mm. In case of response to ADA/IFX a significant reduction in BWT was observed after 2 weeks (p=0.04), whereas non-responders displayed no significant changes. The TTP was notably accelerated at baseline and significantly normalised by week 2 in responders (p=0.001), while non-responders exhibited no significant alterations (p=0.9). At week 2, the endoscopic Mayo score did not exhibit any changes, thus failing to predict treatment responses.dCEUS enables the early detection of therapy response in patients with aUC, which serves as a predictive marker for long term clinical success. Therefore, dCEUS serves as a diagnostic tool for assessing the probability of future therapy success.}", issn = {1873-9946}, doi = {10.1093/ecco-jcc/jjae034}, url = {https://doi.org/10.1093/ecco-jcc/jjae034}, eprint = {https://academic.oup.com/ecco-jcc/advance-article-pdf/doi/10.1093/ecco-jcc/jjae034/56911128/jjae034.pdf}, } |
High-resolution rectoscopy using MHz optical coherence tomography: a step towards real time 3D endoscopy, Scientific Reports , vol. 14, no. 1, pp. 4672, Feb. 2024.
DOI: | 10.1038/s41598-024-55338-5 |
Bibtex: | ![]() @article{RN5474, author = {Schulte, Berenice;Göb, Madita;Singh, Awanish Pratap;Lotz, Simon;Draxinger, Wolfgang;Heimke, Marvin;pieper, Mario;Heinze, Tillmann;Wedel, Thilo;Rahlves, Maik;Huber, Robert and Ellrichmann, Mark}, title = {High-resolution rectoscopy using MHz optical coherence tomography: a step towards real time 3D endoscopy}, journal = {Scientific Reports}, volume = {14}, number = {1}, pages = {4672}, ISSN = {2045-2322}, DOI = {10.1038/s41598-024-55338-5}, url = {https://doi.org/10.1038/s41598-024-55338-5}, year = {2024}, type = {Journal Article} } |
Mechanical characteristics of glioblastoma and peritumoral tumor-free human brain tissue, Acta Neurochirurgica , vol. 166, no. 1, pp. 102, Feb. 2024.
DOI: | 10.1007/s00701-024-06009-x |
Bibtex: | ![]() @article{RN5472, author = {Kren, Jessica;Skambath, Isabelle;Kuppler, Patrick;Buschschlüter, Steffen;Detrez, Nicolas;Burhan, Sazgar;Huber, Robert;Brinkmann, Ralf and Bonsanto, Matteo Mario}, title = {Mechanical characteristics of glioblastoma and peritumoral tumor-free human brain tissue}, journal = {Acta Neurochirurgica}, volume = {166}, number = {1}, pages = {102}, ISSN = {0942-0940}, DOI = {10.1007/s00701-024-06009-x}, url = {https://doi.org/10.1007/s00701-024-06009-x}, year = {2024}, type = {Journal Article} } |
Phase unwrapping for MHz optical coherence elastography and application to brain tumor tissue, Biomed. Opt. Express , vol. 15, no. 2, pp. 1038--1058, Feb. 2024. Optica Publishing Group.
DOI: | 10.1364/BOE.510020 |
Bibtex: | ![]() @article{Burhan:24, author = {Sazgar Burhan and Nicolas Detrez and Katharina Rewerts and Paul Strenge and Steffen Buschschl\"{u}ter and Jessica Kren and Christian Hagel and Matteo Mario Bonsanto and Ralf Brinkmann and Robert Huber}, journal = {Biomed. Opt. Express}, keywords = {High speed imaging; Imaging systems; In vivo imaging; Magnetic resonance imaging; Phase noise; Phase shift}, number = {2}, pages = {1038--1058}, publisher = {Optica Publishing Group}, title = {Phase unwrapping for MHz optical coherence elastography and application to brain tumor tissue}, volume = {15}, month = {Feb}, year = {2024}, url = {https://opg.optica.org/boe/abstract.cfm?URI=boe-15-2-1038}, doi = {10.1364/BOE.510020}, abstract = {During neuro-oncologic surgery, phase-sensitive optical coherence elastography (OCE) can be valuable for distinguishing between healthy and diseased tissue. However, the phase unwrapping process required to retrieve the original phase signal is a challenging and critical task. To address this issue, we demonstrate a one-dimensional unwrapping algorithm that recovers the phase signal from a 3.2\&\#x2005;MHz OCE system. With a processing time of approximately 0.11 s per frame on the GPU, multiple 2\&\#x03C0; wraps are detected and corrected. By utilizing this approach, exact and reproducible information on tissue deformation can be obtained with pixel accuracy over the entire acquisition time. Measurements of brain tumor-mimicking phantoms and human ex vivo brain tumor samples verified the algorithm\&\#x0027;s reliability. The tissue samples were subjected to a 200\&\#x2005;ms short air pulse. A correlation with histological findings confirmed the algorithm\&\#x0027;s dependability.}, } |
Virtual Hall sensor triggered multi-MHz endoscopic OCT imaging for stable real-time visualization, Opt. Express , vol. 32, no. 4, pp. 5809--5825, Feb. 2024. Optica Publishing Group.
DOI: | 10.1364/OE.514636 |
Bibtex: | ![]() @article{Singh:24, author = {Awanish Pratap Singh and Madita G\"{o}b and Martin Ahrens and Tim Eixmann and Berenice Schulte and Hinnerk Schulz-Hildebrandt and Gereon H\"{u}ttmann and Mark Ellrichmann and Robert Huber and Maik Rahlves}, journal = {Opt. Express}, keywords = {Biomedical imaging; Endoscopic imaging; Imaging systems; Optical coherence tomography; Real time imaging; Vertical cavity surface emitting lasers}, number = {4}, pages = {5809--5825}, publisher = {Optica Publishing Group}, title = {Virtual Hall sensor triggered multi-MHz endoscopic OCT imaging for stable real-time visualization}, volume = {32}, month = {Feb}, year = {2024}, url = {https://opg.optica.org/oe/abstract.cfm?URI=oe-32-4-5809}, doi = {10.1364/OE.514636}, abstract = {Circumferential scanning in endoscopic imaging is crucial across various disciplines, and optical coherence tomography (OCT) is often the preferred choice due to its high-speed, high-resolution, and micron-scale imaging capabilities. Moreover, real-time and high-speed 3D endoscopy is a pivotal technology for medical screening and precise surgical guidance, among other applications. However, challenges such as image jitter and non-uniform rotational distortion (NURD) are persistent obstacles that hinder real-time visualization during high-speed OCT procedures. To address this issue, we developed an innovative, low-cost endoscope that employs a brushless DC motor for scanning, and a sensorless technique for triggering and synchronizing OCT imaging with the scanning motor. This sensorless approach uses the motor\&\#x2019;s electrical feedback (back electromotive force, BEMF) as a virtual Hall sensor to initiate OCT image acquisition and synchronize it with a Fourier Domain Mode-Locked (FDML)-based Megahertz OCT system. Notably, the implementation of BEMF-triggered OCT has led to a substantial reduction in image jitter and NURD (\<4 mrad), thereby opening up a new window for real-time visualization capabilities. This approach suggests potential benefits across various applications, aiming to provide a more accurate, deployable, and cost-effective solution. Subsequent studies can explore the adaptability of this system to specific clinical scenarios and its performance under practical endoscopic conditions.}, } |
Microscope-integrated optical coherence tomography for in vivo human brain tumor detection with artificial intelligence, Journal of Neurosurgery , pp. 1 - 9, 2024. American Association of Neurological Surgeons.
DOI: | 10.3171/2024.1.JNS231511 |
Bibtex: | ![]() @article { Microscopeintegratedopticalcoherencetomographyforinvivohumanbraintumordetectionwithartificialintelligence, author = "Patrick Kuppler and Paul Strenge and Birgit Lange and Sonja Spahr-Hess and Wolfgang Draxinger and Christian Hagel and Dirk Theisen-Kunde and Ralf Brinkmann and Robert Huber and Volker Tronnier and Matteo Mario Bonsanto", title = "Microscope-integrated optical coherence tomography for in vivo human brain tumor detection with artificial intelligence", journal = "Journal of Neurosurgery", year = "2024", publisher = "American Association of Neurological Surgeons", doi = "10.3171/2024.1.JNS231511", pages= "1 - 9", url = "https://thejns.org/view/journals/j-neurosurg/aop/article-10.3171-2024.1.JNS231511/article-10.3171-2024.1.JNS231511.xml" } |
2023
828 kHz retinal imaging with an 840 nm Fourier domain mode locked laser, Biomed. Opt. Express , vol. 14, no. 12, pp. 6493-6508, Nov. 2023. Optica Publishing Group.
DOI: | 10.1364/BOE.504302 |
Bibtex: | ![]() @article{Klufts:23, author = {Marie Klufts and Alejandro Martinez Jimenez and Simon Lotz and Muhammad Asim Bashir and Tom Pfeiffer and Alexander Mlynek and Wolfgang Wieser and Alexander Chamorovskiy and Adrian Bradu and Adrian Podoleanu and Robert Huber}, journal = {Biomed. Opt. Express}, keywords = {Analog to digital converters; Laser beams; Laser imaging; Laser modes; Point spread function; Vertical cavity surface emitting lasers}, number = {12}, pages = {6493--6508}, publisher = {Optica Publishing Group}, title = {828 kHz retinal imaging with an 840\&\#x2005;nm Fourier domain mode locked laser}, volume = {14}, month = {Dec}, year = {2023}, url = {https://opg.optica.org/boe/abstract.cfm?URI=boe-14-12-6493}, abstract = {This paper presents a Fourier domain mode locked (FDML) laser centered around 840 nm. It features a bidirectional sweep repetition rate of 828 kHz and a spectral bandwidth of 40 nm. An axial resolution of ∼9.9 µm in water and a 1.4 cm sensitivity roll-off are achieved. Utilizing a complex master-slave (CMS) recalibration method and due to a sufficiently high sensitivity of 84.6 dB, retinal layers of the human eye in-vivo can be resolved during optical coherence tomography (OCT) examination. The developed FDML laser enables acquisition rates of 3D-volumes with a size of 200 × 100 × 256 voxels in under 100 milliseconds. Detailed information on the FDML implementation, its challenging design tasks, and OCT images obtained with the laser are presented in this paper.}, } |
Advanced FFT-based contrast approach for MHz optical coherence elastography, in Optical Coherence Imaging Techniques and Imaging in Scattering Media V , Benjamin J. Vakoc and Maciej Wojtkowski and Yoshiaki Yasuno, Eds. SPIE, Aug.2023. pp. 1263215.
DOI: | 10.1117/12.2670957 |
Bibtex: | ![]() @inproceedings{10.1117/12.2670957, author = {Sazgar Burhan and Nicolas Detrez and Madita G{\"o}b and Matteo Mario Bonsanto and Ralf Brinkmann and Robert Huber}, title = {{Advanced FFT-based contrast approach for MHz optical coherence elastography}}, volume = {12632}, booktitle = {Optical Coherence Imaging Techniques and Imaging in Scattering Media V}, editor = {Benjamin J. Vakoc and Maciej Wojtkowski and Yoshiaki Yasuno}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {1263215}, abstract = {Optical coherence elastography represents mechanical characteristics of biological tissue in so-called mechanical contrast maps. In addition to the standard intensity image, the contrast map illustrates numerous mechanical tissue features that would otherwise be undetectable. This is of great interest as abnormal physiological changes influence the mechanical behavior of the tissue. We demonstrate an advanced mechanical contrast approach based on the phase signal of our 3.2 MHz optical coherence tomography system. The robustness and performance of this contrast approach is evaluated and discussed based on preliminary results. }, keywords = {Optical Coherence Tomography, OCT, Megahertz OCT, Fourier Domain Mode Locking, Optical Coherence Elastography, OCE, Phase-sensitive OCT, Biomechanics}, year = {2023}, doi = {10.1117/12.2670957}, URL = {https://doi.org/10.1117/12.2670957} } |
Advances in large area robotically assisted OCT (LARA-OCT): towards drive-by continuous motion imaging, in Optical Coherence Imaging Techniques and Imaging in Scattering Media V , Benjamin J. Vakoc and Maciej Wojtkowski and Yoshiaki Yasuno, Eds. SPIE, Aug.2023. pp. 126321N.
DOI: | 10.1117/12.2670950 |
Bibtex: | ![]() @inproceedings{10.1117/12.2670950, author = {Madita G{\"o}b and Simon Lotz and Linh Ha-Wissel and Sazgar Burhan and Sven B{\"o}ttger and Floris Ernst and Jennifer Hundt and Robert Huber}, title = {{Advances in large area robotically assisted OCT (LARA-OCT): towards drive-by continuous motion imaging}}, volume = {12632}, booktitle = {Optical Coherence Imaging Techniques and Imaging in Scattering Media V}, editor = {Benjamin J. Vakoc and Maciej Wojtkowski and Yoshiaki Yasuno}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {126321N}, abstract = {Optical coherence tomography is a powerful imaging technique to visualize and localize depth-dependent tissue structure to differentiate between healthy and pathological conditions. However, conventional OCT systems are only capable of detecting small areas. To overcome this limitation, we have developed a large area robotically assisted OCT (LARA-OCT) system for automatic acquisition of large OCT images. Using mosaic pattern acquisition and subsequent stitching, we previously demonstrated initial in vivo OCT skin images beyond 10 cm². To improve acquisition speed and reduce dead times, we here demonstrate and analyze LARA-OCT with a new drive-by continuous motion imaging protocol.}, keywords = {Optical Coherence Tomography, Fourier Domain Mode Locking, Robotically Assisted Imaging Systems, Three-dimensional image acquisition, Large Area Scanning, Skin Imaging, OCT, FDML}, year = {2023}, doi = {10.1117/12.2670950}, URL = {https://doi.org/10.1117/12.2670950} } |
Microscope integrated realtime high density 4D MHz-OCT in neurosurgery: a depth and tissue resolving visual contrast channel and the challenge of fused presentation, in Translational Biophotonics: Diagnostics and Therapeutics III , Zhiwei Huang and Lothar D. Lilge, Eds. SPIE, Aug.2023. pp. 126270W.
DOI: | 10.1117/12.2670953 |
Bibtex: | ![]() @inproceedings{10.1117/12.2670953, author = {Wolfgang Draxinger and Dirk Theisen-Kunde and Lion Schuetz and Nicolas Detrez and Paul Strenge and Maximilian Rixius and Veit Danicke and Wolfgang Wieser and Jessica Kren and Patrick Kuppler and Sonja Spar-Hess and Matteo Mario Bonsanto M.D. and Ralf Brinkmann and Robert Huber}, title = {{Microscope integrated realtime high density 4D MHz-OCT in neurosurgery: a depth and tissue resolving visual contrast channel and the challenge of fused presentation}}, volume = {12627}, booktitle = {Translational Biophotonics: Diagnostics and Therapeutics III}, editor = {Zhiwei Huang and Lothar D. Lilge}, organization = {International Society for Optics and Photonics}, publisher = {SPIE}, pages = {126270W}, abstract = {Microscope integrated realtime 4D MHz-OCT operating at high scanning densities are capable of capturing additional visual contrast resolving depth and tissue. Even within a plain C-scan en-face projection structures are recognizable, that are not visible in a white light camera image. With advanced post processing methods, such as absorbtion coefficient mapping, and morphological classifiers more information is extraced. Presentation to the user in an intuitive way poses practical challenges that go beyond the implementation of a mere overlay display. We present our microscope integrated high speed 4D OCT imaging system, its clinical study use for in-vivo brain tissue imaging, and user feedback on the presentation methods we developed.}, keywords = {optical coherence tomography, neurosurgery, tissue contrast, image fusion, surgical guidance, theranostics}, year = {2023}, doi = {10.1117/12.2670953}, URL = {https://doi.org/10.1117/12.2670953} } |
13.4 MHz FDML Laser for Intra-Surgical Optical Coherence Tomography, in 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) , Jul.2023. pp. 1.
DOI: | 10.1109/CLEO/Europe-EQEC57999.2023.10231419 |
Bibtex: | ![]() @INPROCEEDINGS{10231419, author={Lotz, Simon and Göb, Madita and Draxinger, Wolfgang and Dick, Anneli and Huber, Robert}, booktitle={2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)}, title={13.4 MHz FDML Laser for Intra-Surgical Optical Coherence Tomography}, year={2023}, volume={}, number={}, pages={1-1}, doi={10.1109/CLEO/Europe-EQEC57999.2023.10231419}} |
Dual Amplification 850 nm FDML Laser, in 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) , Jul.2023. pp. 1.
DOI: | 10.1109/CLEO/Europe-EQEC57999.2023.10232019 |
Bibtex: | ![]() @INPROCEEDINGS{10232019, author={Klufts, M. and Lotz, S. and Bashir, M. A. and Pfeiffer, T. and Mlynek, A. and Wieser, W. and Chamorovskiy, A. and Shidlovski, V. and Podoleanu, A. and Huber, R.}, booktitle={2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)}, title={Dual Amplification 850 nm FDML Laser}, year={2023}, volume={}, number={}, pages={1-1}, doi={10.1109/CLEO/Europe-EQEC57999.2023.10232019}} |
Four-Wave Mixing Fast Wavelength Sweeping FDML Laser with kW Peak Power at 900 nm and 1300 nm, in 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) , Jul.2023. pp. 1.
DOI: | 10.1109/CLEO/Europe-EQEC57999.2023.10232141 |
Bibtex: | ![]() @INPROCEEDINGS{10232141, author={Lamminger, Philipp and Hakert, Hubertus and Lotz, Simon and Kolb, Jan Philip and Kutscher, Tonio and Karpf, Sebastian and Huber, Robert}, booktitle={2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)}, title={Four-Wave Mixing Fast Wavelength Sweeping FDML Laser with kW Peak Power at 900 nm and 1300 nm}, year={2023}, volume={}, number={}, pages={1-1}, doi={10.1109/CLEO/Europe-EQEC57999.2023.10232141}} |
1190 nm FDML laser: Challenges and Strategies, in 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) , Jul.2023. pp. 1.
DOI: | 10.1109/CLEO/Europe-EQEC57999.2023.10232661 |
Bibtex: | ![]() @INPROCEEDINGS{10232661, author={Bashir, M. A. and Lotz, S. and Kluftsa, M. and Jirauschek, C. and Huberab, R.}, booktitle={2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)}, title={1190 nm FDML laser: Challenges and Strategies}, year={2023}, volume={}, number={}, pages={1-1}, doi={10.1109/CLEO/Europe-EQEC57999.2023.10232661}} |
Text